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gpgrt-config: Fix behavior when PKG_CONFIG_LIBDIR="".

Description

gpgrt-config: Fix behavior when PKG_CONFIG_LIBDIR="".

* src/gpgrt-config.in: Correctly detect the case.
  • GnuPG-bug-id: T5595
  • Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>